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				 		<p><strong>Did you know?</strong><p>
						<p>The Earth contains four parts that work together as a complex system : land, water, air, and life. The four major systems called Earth spheres:
						<p><strong>Geosphere:</strong> which is the part of the Earth system that contains the processes that shape the Earth's surface and its minerals, rocks and landforms.</p>
						<p><strong>Hydrosphere:</strong> it is the liquid water element of the Earth including seas, oceans, lakes, rivers and streams. It covers 70% of the Earth the surface.
						<p><strong>Atmosphere: </strong> It is the air that we breath.</p>
						<p><strong>Biosphere:</strong>It is made up of   all of the domains of living organisms , animals on Earth 
						ecosystems  and  populations on Earth.</p>
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				    	<h1>Earth layers</h1><br/>
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								Do you know what's inside the Earth?<br/> 
								Scientists help us learn about it and they discovered that  the Earth made up of a different layers which are:</p>
								<p class="topichead">➢ Crust:</p>	
								<p>•	It is the outer layer of the Earth.<br/>
								 •	It is the solid, tangible, visible, matter that we live on.<br/>
								 •	It is what makes up the continents and the countries, even the floor below the deepest seas.<br/>
								 •	It is responsible for supporting the life on Earth.<br/>
								 •	It is mainly made up of oxygen and silicon and consists of aluminum, iron, calcium, sodium, potassium, magnesium, and other metals. </p>
								<p class="topichead">➢ Mantle:<p>
								<p>•It is the thick layer that contains a hot, solid materials that are found between the crust and the core. <br/>
								•	The mantle is considered to make up most of the Earth since it accounts to two-thirds of the planet’s mass.<br/>
								 •	The mantle is a mix of magnesium, silicon, iron, and oxygen mostly. </p>
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								<p class="topichead">➢ The outer Core:</p> 
								<p>•	It is a liquid (molten) layer of Earth if you are coming from the crust.<br/>
								 •	It is thick and is composed of mainly iron and nickel. <br/>
								•	It is so hot that it reaches 4,400 degrees Celsius, rendering all materials in its molten state.  <br/>
								•	An important property of the outer core is that it convects turbulently. And this convection generates the Earth’s magnetic field. </p>
								<p class="topichead">➢ The  inner core:</p>
								<p> •	It is a solid and highly dense layer of the Earth. <br/>
								•	It is believed to be composed of iron-nickel alloy.<br>
								 •	There is more to be discovered about the inner core but scientists believe that it is in the process of expanding as more and more of the outer core solidifies because of the internal cooling of the Earth. </p> 
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						<p>The Earth consists of four layers. They are the crust, mantle, inner and outer core. The crust is the outer layer, which consist of the land and seas. The mantle is between the crust and core. It is a thick hot solid layer. It is the largest layer and accounts for two-thirds of the planet’s mass. The outer core is a liquid layer and holds the Earth’s magnetic field. The inner core is a dense solid layer it is able to deflect seismic waves.
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